To claim this audio as having Vivekananda’s Voice needs strong proof. I am not convinced that this is his voice. I will point out one thing. The currently available published version of his speech on 11 Sep. 1893 does not have one line which was found in the original published version of the official bodies of Parliament of Religions as well as the book published by Sri G. Natesan Iyer from Madras during the lifetime of Swami Vivekananda. Since it is well known that Vivekananda spoke extempore there is no question of this line having found its way into the official books if Vivekananda had not spoken it. This audio does not have that line. So to me this is conclusive proof that this audio does not have the voice of Vivekananda. The missing line is : 'I am proud to tell you that I belong to a religion into whose sacred language, the Sanscrit, the word seclusion is untranslatable'.

See : http://archive.org/stream/neelyshistory00unknuoft/neelyshistory00unknuoft_djvu.txt and also page 102 of the book by Barrows :
http://www.vivekananda.net/PDFBooks/The_World_s_Parliament_of_Religions.pdf

I have investigated the subject about a decade ago. All my findings are from Ram Krishna Math and its associates.
The Album was published by Ramkrishna Mission on the Centenary year of Swami Vivekananda.
Ramakrishna Mission did not mention in the inlay card that the voice is someone else's.
When asked, the publishers explained the matter as some legal complications. They did not give a reason for this at that time.
The voice is of N. Viswanathan, the famous English professor of St. Xaviers College Calcutta.
I cannot remember now which monk gave this information but certainly he was associated with the work.
Later on one of the students of Prof. N Viswanathan confirmed that it was him. About ten years back I shared a taxi with two other gentlemen. They were discussing the said subject. When asked, one of them told me that he was a student of Prof. N Viswanathan. He confirmed that Mr. Viswanathan read out the speech.
Now HamaraCD.com credits Subir Ghosh as the reader which seems to be incorrect.
There is no recorded voice of Swamiji. This has been confirmed by the monks of the Ramakrishna Mission who were involved in the centenary publications. They searched and probed for the same during the speech's centenary celebration. BBC once confirmed RK Mission that they don't have any recording of this kind.

i cant download this

its a very good speach i love it